You changed the rear end gearing by going to a taller tire. You need to either go back to the smaller tire or change gears to compensate. You're comparing apples to oranges when you don't have the same drive ratios and you're comparing ETs. The smaller diameter tires are always going to improve your times. That's why we have 4.10s instead of 3.42s NA at the track. I dropped .3 in the 1/4 just by going from 3.42s to 4.10s.

 

well in spokane wa with the 28's slicks i ran a 13.05@102mph and tried the 26's slicks and ran a 13.16@101mph, all in the same day with temps around 75*

 

Have you checked to see if your I/C pump is working?

One thing I know for sure, the TB converter was the worst mod I ever did.